Radial intensity gradients of galactic cosmic rays (1972-1995) in the heliosphere

Details Radial intensity gradients of galactic cosmic rays (1972-1995) in the heliosphere Radial intensity gradients of galactic cosmic rays (1972-1995) in the heliosphere

Oct 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997jgr...10224201f&link_type=abstract

Journal of Geophysical Research, Volume 102, Issue A11, p. 24201-24208

Physics

Plasma Physics

26

Interplanetary Physics: Cosmic Rays, Interplanetary Physics: Mhd Waves And Turbulence, Interplanetary Physics: Solar Cycle Variations, Space Plasma Physics: Charged Particle Motion And Acceleration

Scientific paper

The radial intensity gradients near the ecliptic plane for galactic cosmic ray He (180-450 MeV/nucleon), H (130-220 MeV), and the integral counting rate of ions >70MeV are studied using the Pioneer 10/11, Voyager 2, and IMP 6, 7, and 8 observing network over the 1972.25-1996.0 time period at heliocentric distances extending to 64 AU. These gradients display complex temporal and spatial changes that are dominated by the 11-year solar activity cycle but with the 22-year heliomagnetic cycle also having an important role. The data are well ordered out to ~55AU using a radial dependence of the intensity gradient gr of the form G0rα, where r is the heliocentric distance in astronomical units (AU). With this representation it becomes possible to estimate gr as a function of r at a given time or as a function of time at a given radial distance. Over successive solar minima these values of gr decrease rapidly with increasing heliocentric distance, and for He at 50 AU are 3 times larger in 1987 than in 1977, in general agreement with the expected effects of particle gradient and curvature drifts in the large-scale interplanetary magnetic field. Near solar maximum the gradients increase significantly over their solar minimum values, with a greatly reduced radial dependence for He, while for H, gr increases with increasing r. The radial gradients of the integral rate of ions >70MeV show a much smaller temporal and spatial variation.

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